Reading whole lines from stream

[wurst-hans]

Replaced char-by-char retrieval from stream via fread() with fgets() to get full line from stream until EOF or newline. This speeds up data transfer by factor 10.

The original code reads single characters from stream until fread() fails, returns empty char or newline. That causes a really huge loop for retrieving emails having bigger attachments. This is not different from using fgets() which might fail or return empty string. But if there is any data, it should be trailed by a newline character. My change behaves in the same way the original code does.

Querying a simple IMAP mailbox that contains 3 emails with attachments (1x 10MB, 2x 5MB attachments), the original code runs for more than 30 seconds to retrieve the emails. Applying the change, the script finishes after 3 seconds.